[okular] [Bug 427913] New: Resizing the sidebar causes disk write to go up

[Singcoi Lau]

https://bugs.kde.org/show_bug.cgi?id=427913

            Bug ID: 427913
           Summary: Resizing the sidebar causes disk write to go up
           Product: okular
           Version: 1.11.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: hollowwings13 at gmail.com
  Target Milestone: ---

jbd2 uses an excessive amount of disk resources when resizing the sidebar.
This is especially annoying on systems with HDDs, such as mine.

iotop sample:
    Total DISK READ :   0.00 B/s | Total DISK WRITE :    103.08  K/s
    Actual DISK READ:   0.00 B/s | Actual DISK WRITE:    1104.06 K/s

    TID   PRIO USER     DISK READ  DISK WRITE SWAPIN   IO    COMMAND
    1095  be/3 root     0.00 B/s    0.00 B/s  0.00 % 81.14 % [jbd2/sda7-8]
    13819 be/4 root     0.00 B/s    0.00 B/s  0.00 %  0.43 %
[kworker/5:0-events]
    13266 be/4 slau     0.00 B/s  103.62 K/s  0.00 %  0.25 % okular

I/O goes back to zero when I release the click.

STEPS TO REPRODUCE
1. Open Ocular
2. Click on the sidebar and drag it side-to-side (with or without a document
opened)

OBSERVED RESULT
brrrrrrrrrrrr


SOFTWARE/OS VERSIONS
OS: openSUSE Tumbleweed
KDE Plasma Version: 5.20.0
KDE Frameworks Version: 5.75.0
Qt Version: 5.15.1
Kernel Version: 5.8.14
Display Server: X11

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